From c44003f7e7254ac972eaa1b22a686471ea4ce2d7 Mon Sep 17 00:00:00 2001 From: Liping Zhang Date: Tue, 20 Sep 2016 02:09:02 -0700 Subject: [PATCH] ipmonitor: fix ip monitor can't work when NET_NS is not enabled In ip monitor, netns_map_init will check getnsid is supported or not. But when /proc/self/ns/net does not exist, we just print out error messages and exit. So user cannot use ip monitor anymore when CONFIG_NET_NS is disabled: # ip monitor open("/proc/self/ns/net"): No such file or directory If open "/proc/self/ns/net" failed, set have_rtnl_getnsid to false. Fixes: d652ccbf8195 ("netns: allow to dump and monitor nsid") Signed-off-by: Liping Zhang Acked-by: Nicolas Dichtel --- ip/ipnetns.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/ip/ipnetns.c +++ b/ip/ipnetns.c @@ -73,8 +73,8 @@ static int ipnetns_have_nsid(void) fd = open("/proc/self/ns/net", O_RDONLY); if (fd < 0) { - perror("open(\"/proc/self/ns/net\")"); - exit(1); + have_rtnl_getnsid = 0; + return 0; } addattr32(&req.n, 1024, NETNSA_FD, fd);